Given the inclination of \(i=52{\mbox{°}}\)  [1]}, the emission from the planet passes through a significant fraction of the column density only if the CPD has an aspect ratio greater than approximately \(\arctan (i)\approx 0.7\) . [2]} found such thick discs for masses \(M_{\mathrm {p}}\sim 0.3~M_{\mathrm {J}}\)  and [3]} found thinner discs with an aspect ratio \(\lesssim 0.4\) , decreasing with increasing mass.
Given that PDS 70 b cannot be too light in order to still emit H \(\alpha \) , its
CPD is likely sufficiently thin to not absorb significantly.
